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Solved: The older versions of IDM are not compatible with FF4. Even when we update the add-on, it doesn't work. Uninstall IDM from your system (Default Removal Setting worked for me) and install IDM v6.05 Build 14 or above. Hope it helps, like it helped me :)

'''Solved:''' The older versions of IDM are not compatible with FF4. Even when we update the add-on, it doesn't work. Uninstall IDM from your system (Default Removal Setting worked for me) and install IDM v6.05 Build 14 or above. Hope it helps, like it helped me :)